Device for steadying rectified currents.



P. H. THOMAS.

DEVICE FOR STEADYING REGTIPIED UURRENTS.

APPLICATION Pusan SEPT.27, 1905.

968,895. Patented Aug. 30, 1910.

TELAUTOGRAFH APPARATUS @QMY /NVENTOH 57%ATTOHNEY- Z UNITED STATES PATENT OFFICE.

PERCY H. THOMAS, OF MONT-CLAIR, NEW JERSEY,..ASSIGNOR TO COOPER HEWITT ELECTRIC COMPANY, OF NEW YORK, N. Y., ACORPORATION 0F NEW.YOB-K.

DEVICE FOR STEADYING RECTIFIED CURRENTS.

Speciflcatimfo! Letters Patent.

Patented A 30,1910.

Application filed-September 27, 1905. Serial H0..280,252.

To all whom it may concern:

Be it known that I, Pnncy H. THOMAS, a citizen of the United States, and resident of Montclair, county of Ess-ex, State of New Jersey, have invented certain new and r eful Improvements in Devices for Steadymg Rectified Currents, of which the following is a specification.

In applying direct current obtained by means of a vapor converter from an alternating'current source to the operation of devices such as telautograph machines requiring an unusually steady source of direct current, difliculty has been experienced with the undulations of current corresponding to the alternations of the supply. It is possible though not always expedient or desirable to reduce the numerical value of these pulsations by merely increasing the keeping-alive in uctance normally used in connection with converters. I have found that by providing an additional choke coil and a resistance, the latter being connected in shunt to the added choke coil and the telautograph apparatus and in series with the original choke coil or inductance, the effects of fluctuation can be still further reduced and a means supplied for keeping the converter alive during the non-operating periods of the telautograph device.

My invention is illustrated in the accompanying diagrammatic drawing.

In this drawing the alternating current source is represented as a transformer having a primary, 1, and a secondary, 2. The converter is shown at 3 as beingprovided with positive electrodes, 4 and 5, tive electrode, (3, and a starting electrode, 7, connected by a wire, 8, with the positive side of the circuit.- The starting electrode 7 is shown simply as a suitable auxiliary for starting the apparatus into operation but any preferred means for starting the converter may be used with or without the em ployment of the snpplenu-ntal starting electrode.

It will be understood that a ielautograph apparatus is chosen simply by way of illustrating a type of apparatus requiring currents having a. high degree of steadiness. This a paratus is shown at 9. The terminals o the secondary 2 are connected with the ositive electrodes 4 and 5, and an intermediate point of the said secondary is connected to the negative electrode, (5, through a a nega-- alive, and a resistance resistance, 10, and an inductance, ll. A-second or'added inductance, 12, is connected to one terminal of the telautograph apparatus, as shown.

When the telautograph apparatus is not taking current, the converter will be kept alive by the choke coil rent which passes through the resistance 10; whereas, during the operating periods of the telautograph apparatus, any pulsations in the current will cause variations in the voltage upon the choke coil, 12, of such a character as to cause variations of current in the resistance 10 tendingto reduce the pulsations of current in the telautograph apparatus.

Thus the system described and shown tends to produce in the telautograph apparatus or other device requirin steady current a condition favorable to its successful operation.

I claim as my invention:

1. The combination with an alternating current supply circuit and a direct current work circult containing a translating device requiring steady current, of a vapor converter and a choke coil for keeping thesame alive, and a. resistance in series with the said choke coil and in shunt upon the translating device, and a second choke coil in the circuit of translation.

2. The combination with an alternating current supply circuit and a direct current work circult containing a translating device requiring steady current, of a vapor converter and a choke coil for keeping the same in series with the said choke coil and in shunt upon the translatin device, and also in shunt upon a secon choke coil, as described.

3.1A system of electrical distribution in which a source of alternating current is connected at its terminals to a vapor converter, and at an intermediate point to the direct current side thereof, in combination with a choke coil in circuit of the rectified current, a resistance in series with the said choke coil, and a second choke coil and a translating device in shunt upon the said resistance. I r

4. A system of electrical distribution in which a source of alternating current is connected at its terminals to a vapor converter, and at an intermediate point to the direct current side thereof, in combination 11 operating on cur-- with a choke coil in circuit of the rectified current, a resistance in series with the sad choke coil, and a translating device 1n shunt upon thesaid resistance, the said shuntcircuit containing an auxiliary choke coil, as described.

5. In a system of electrical distribution,

the combination with an alternating supply coil for keeping alive said rectifier and means for opposing a substantially prohibitive electromotive force to rapid variations in said supply, together with means for shunting excess current due to supply variations around the direct current work circuit.

Signed at New York, in the county of New York, and State of New York, this 25th day of September, A. D. 1905.

PERCY H. THOMAS.

Witnesses:

WM. H. CAIEL, 'Tnos. H. BROWN. 

